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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7230) Add rolling downgrade documentation
Date Thu, 30 Oct 2014 17:52:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jing Zhao updated HDFS-7230:
       Resolution: Fixed
    Fix Version/s: 2.6.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

I've committed this to trunk, branch-2, and branch-2.6. Thanks Nicholas for the contribution
and thanks Mit for the review.

> Add rolling downgrade documentation
> -----------------------------------
>                 Key: HDFS-7230
>                 URL: https://issues.apache.org/jira/browse/HDFS-7230
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>             Fix For: 2.6.0
>         Attachments: h7230_20141028.patch
> HDFS-5535 made a lot of improvement on rolling upgrade.  It also added the cluster downgrade
feature.  However, the downgrade described in HDFS-5535 requires cluster downtime.  In this
JIRA, we discuss how to do rolling downgrade, i.e. downgrade without downtime.

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